package com.ynny.interfance_;

public class UsbTest {
    public static void main(String[] args) {

//        Usb usb = new Usb();
        //static
        String type = Usb.TYPE;
        System.out.println(type);


        Usb3 usb3 = new Usb3();
        usb3.enter();
        usb3.exit();
    }
}
